I 'cleaned' My Focusing Screen

Yes, I made the horrible mistake of trying to clean the focusing screen in my SLR camera, a Canon T3i (600d). I am (as I'm sure you have guessed by now) new to SLR cameras. As the it is now there are several particles on the focusing screen and the auto focus points are a little blurry. The red light up dots are a bit dim and blurry too. I was hoping for advice on what to do (I would prefer not to leave it like this).I found where I can purchase a new focusing screen online for about $14 US (I live in the US) which, to me sounds pretty reasonable. I searched for instructions on how to replace a focusing screen and came up with mixed results. Do you think that I should steer clear of doing this myself or is it a possibility? If it is a possibility do they have to be aligned precisely or anything? Or will the new one simply fit perfectly into the slot where the old one came out?I feel really bad that I made such a stupid mistake (don't fix it if it's not broken, right?). Your advise is much appreciated, Thanks!